The proposed rule changes being discussed for service rifle class next year have been posted on the CMP forum via an email response to an inquiry to Mark from CMP. 
Click here to read the thread

New rules package so far…. These are the changes thus far that are being discussed.

Service Rifle:
1) The only alibis that will be permitted are range alibis (no fault of the shooter).

2) Optics will be allowed on rifles that weigh 11.5 lbs., total with optic installed. Optics will only be allowed on the AR platform. The optic maximum magnification will be 4.5 power. There will not be a separate category for optical sighted ARs.

3) No weight limit on iron sighted, non-optical sighted ARs, i.e. you can shoot the current configured service rifle just as it is with no weight restrictions.

4) Only .223/5.56 NATO will be allowed for ARs, .308/7.62 NATO for M14 platforms, .308/7.62 NATO or .30/06 for M1 Garands.

5) M-4 type stocks will be allowed on the AR platforms.

If the rules pass the up-coming CMP Rules Committee meeting the new rules package will be implemented in the 2016 CMP Rules for Service Rifle and Service Pistol. Just a note a service rifle with no lead front or back weighs 10.9 pounds with carry handle installed. Remove the carry handle and install a 1-4.5 power scope and rings you get 11.25 lbs. With that said we set the weight limit with optics at 11.5 lbs. If you want to shoot with a scope you will not be able to lead the rifle. If you want to shoot with iron sights go as heavy as you like.

Best Regards,

Mark Johnson
Chief Operating Officer
Civilian Marksmanship Program

Which means the choice is weights or optics.

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Irons